Question

1.我有java函数加密xml文件并返回加密的String。

/// Java Class 
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

public class Crypt {

    public static String key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    public static byte[] key_Array = Base64.decodeBase64(key);

    public static String encrypt(String strToEncrypt)
    {       
        try
        {   
            //Cipher _Cipher = Cipher.getInstance("AES");
            //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            //Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");      

            Key SecretKey = new SecretKeySpec(key_Array, "AES");

            Cipher _Cipher = Cipher.getInstance("AES");     
            _Cipher.init(Cipher.ENCRYPT_MODE, SecretKey);       

            return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));     
        }
        catch (Exception e)
        {
            System.out.println("[Exception]:"+e.getMessage());
        }
        return null;
    }

    public static void main(String[] args) {        
        StringBuilder sb = new StringBuilder();
        sb.append("xml file string ...");

        String EncryptedString = encrypt(sb.toString());        
        System.out.println("[EncryptedString]:"+EncryptedString);
    }
}

2.我有c＃函数解密由java函数加密的消息。

/// C# Function
private static string Decrypt(string encryptedText)
{
    RijndaelManaged aesEncryption = new RijndaelManaged();            
    aesEncryption.BlockSize = 256;
    //aesEncryption.KeySize = 256;
    //aesEncryption.Mode = CipherMode.CBC;
    //aesEncryption.Padding = PaddingMode.PKCS7;

    string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    //string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";        

    byte[] keyArr = Convert.FromBase64String(keyStr);
    //byte[] ivArr = Convert.FromBase64String(ivStr);

    aesEncryption.Key = keyArr;
    //aesEncryption.IV = ivArr;

    ICryptoTransform decrypto = aesEncryption.CreateDecryptor();

    byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);  
    byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length); /// CryptographicException: Length of the data to decrypt is invalid.    
    return ASCIIEncoding.UTF8.GetString(decryptedData); 
}

Java加密功能运行良好。但问题是C＃功能，当我解密时我得到以下错误信息

CryptographicException: Length of the data to decrypt is invalid.

我使用下面的参考

搜索了解决方案

AES Encryption in Java and Decryption in C#
C# / Java | AES256 encrypt/decrypt
Encyption/Decryption in C# and Java

但我仍然面临同样的错误。请有人给我建议。

更新

我只是改变了我的C＃加密功能。以下是我的更改列表

块大小为128
密钥大小为256
IV尺寸为16
密钥大小为32

/// Updated decrypt function
private static string Decrypt(string encryptedText)
{
    RijndaelManaged aesEncryption = new RijndaelManaged();            
    aesEncryption.BlockSize = 128;
    aesEncryption.KeySize = 256;

    //aesEncryption.Mode = CipherMode.CBC;
    aesEncryption.Padding = PaddingMode.None;

    string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";           

    byte[] ivArr = Convert.FromBase64String(ivStr);
    byte[] IVkey16BytesValue = new byte[16];
    Array.Copy(ivArr, IVkey16BytesValue, 16);

    byte[] keyArr = Convert.FromBase64String(keyStr);
    byte[] KeyArr32BytesValue = new byte[32];
    Array.Copy(keyArr, KeyArr32BytesValue, 32);

    aesEncryption.IV = IVkey16BytesValue;
    aesEncryption.Key = KeyArr32BytesValue; 

    ICryptoTransform decrypto = aesEncryption.CreateDecryptor();

    byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
    byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length); 
    return ASCIIEncoding.UTF8.GetString(decryptedData);
}

此时，不会发生错误。但我得到了解密的消息，我无法阅读。

g:�\0�\td��Y\\符O����\rL��W�wHm�>f�\au����%��0��\ ..........

请让我再次得到你的建议。

Answer 1

在我从@deathismyfriend和其他人那里得到非常有用的建议之后，我发现了我在C＃Decrypt函数中缺少的东西。所以我改变了我的功能如下。

/// C# Error Fixed Version - CipherMode.ECB
public static string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

private static string Encrypt(string PlainText)
{
    RijndaelManaged aes = new RijndaelManaged();
    aes.BlockSize = 128;
    aes.KeySize = 256;

    /// In Java, Same with below code
    /// Cipher _Cipher = Cipher.getInstance("AES");  // Java Code
    aes.Mode = CipherMode.ECB; 

    byte[] keyArr = Convert.FromBase64String(keyStr);
    byte[] KeyArrBytes32Value = new byte[32];
    Array.Copy(keyArr, KeyArrBytes32Value, 32);

    aes.Key = KeyArrBytes32Value;

    ICryptoTransform encrypto = aes.CreateEncryptor();

    byte[] plainTextByte = ASCIIEncoding.UTF8.GetBytes(PlainText);
    byte[] CipherText = encrypto.TransformFinalBlock(plainTextByte, 0, plainTextByte.Length);
    return Convert.ToBase64String(CipherText);
}

private static string Decrypt(string CipherText)
{  
    RijndaelManaged aes = new RijndaelManaged();
    aes.BlockSize = 128;
    aes.KeySize = 256;

    /// In Java, Same with below code
    /// Cipher _Cipher = Cipher.getInstance("AES");  // Java Code
    aes.Mode = CipherMode.ECB;

    byte[] keyArr = Convert.FromBase64String(keyStr);
    byte[] KeyArrBytes32Value = new byte[32];
    Array.Copy(keyArr, KeyArrBytes32Value, 32);

    aes.Key = KeyArrBytes32Value;

    ICryptoTransform decrypto = aes.CreateDecryptor();

    byte[] encryptedBytes = Convert.FromBase64CharArray(CipherText.ToCharArray(), 0, CipherText.Length);
    byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
    return ASCIIEncoding.UTF8.GetString(decryptedData);
}

通过使用upper c＃函数，现在我可以解密并读取密文以下是我一次又一次收到错误后发现的内容。

CryptographicException: Padding is invalid and cannot be removed.

 Solution:  
_RijndaelManaged.Padding = CipherMode.xxx;    ///should toggle here
_RijndaelManaged.Padding = PaddingMode.xxx;   ///should toggle here 


CryptographicException: Length of the data to decrypt is invalid. 
CryptographicException: Specified initialization vector (IV) does not match the block size for this algorithm.

Solution
1. _RijndaelManaged.BlockSize = 128; /// Must be
2. _RijndaelManaged.KeySize = 256; /// Must be
3. _RijndaelManaged.Key = Byte Array Size must be 32 in length ( more detail 32*8 = 256 KeySize )
4. _RijndaelManaged.IV = Byte Array Size must be 16 in length ( more detail 16*8 = 128 BlockSize)

但是出于安全原因，我认为我不应该使用ECB模式根据

ECB mode is not secure
StackOverFlow link

所以我在Java和C＃中再次修改它。

// Java code - Cipher mode CBC version.
// CBC version need Initialization vector IV.
// Reference from https://stackoverflow.com/questions/6669181/why-does-my-aes-encryption-throws-an-invalidkeyexception/6669812#6669812

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

public class CryptoSecurity {

    public static String key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    public static byte[] key_Array = Base64.decodeBase64(key);

    public static String encrypt(String strToEncrypt)
    {       
        try
        {   
            //Cipher _Cipher = Cipher.getInstance("AES");
            //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");        

            // Initialization vector.   
            // It could be any value or generated using a random number generator.
            byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            Key SecretKey = new SecretKeySpec(key_Array, "AES");    
            _Cipher.init(Cipher.ENCRYPT_MODE, SecretKey, ivspec);       

            return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));     
        }
        catch (Exception e)
        {
            System.out.println("[Exception]:"+e.getMessage());
        }
        return null;
    }

    public static String decrypt(String EncryptedMessage)
    {
        try
        {
            //Cipher _Cipher = Cipher.getInstance("AES");
            //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");            

            // Initialization vector.   
            // It could be any value or generated using a random number generator.
            byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            Key SecretKey = new SecretKeySpec(key_Array, "AES");
            _Cipher.init(Cipher.DECRYPT_MODE, SecretKey, ivspec);           

            byte DecodedMessage[] = Base64.decodeBase64(EncryptedMessage);
            return new String(_Cipher.doFinal(DecodedMessage));

        }
        catch (Exception e)
        {
            System.out.println("[Exception]:"+e.getMessage());          

        }
        return null;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        StringBuilder sb = new StringBuilder();

        sb.append("xml file string ...");

        String outputOfEncrypt = encrypt(sb.toString());        
        System.out.println("[CryptoSecurity.outputOfEncrypt]:"+outputOfEncrypt);

        String outputOfDecrypt = decrypt(outputOfEncrypt);        
        //String outputOfDecrypt = decrypt(sb.toString());        
        System.out.println("[CryptoSecurity.outputOfDecrypt]:"+outputOfDecrypt);
    }

}

在C＃中，我修改如下。

// C# Code, CipherMode.CBC
// CBC version need Initialization vector IV.

public static string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static string Encrypt(string PlainText)
{
    RijndaelManaged aes = new RijndaelManaged();
    aes.BlockSize = 128;
    aes.KeySize = 256;

    // It is equal in java 
    /// Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");    
    aes.Mode = CipherMode.CBC;  
    aes.Padding = PaddingMode.PKCS7; 

    byte[] keyArr = Convert.FromBase64String(keyStr);
    byte[] KeyArrBytes32Value = new byte[32];
    Array.Copy(keyArr, KeyArrBytes32Value, 32);

    // Initialization vector.   
    // It could be any value or generated using a random number generator.
    byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
    byte[] IVBytes16Value = new byte[16];
    Array.Copy(ivArr, IVBytes16Value, 16);

    aes.Key = KeyArrBytes32Value;
    aes.IV = IVBytes16Value;

    ICryptoTransform encrypto = aes.CreateEncryptor();

    byte[] plainTextByte = ASCIIEncoding.UTF8.GetBytes(PlainText);
    byte[] CipherText = encrypto.TransformFinalBlock(plainTextByte, 0, plainTextByte.Length);
    return Convert.ToBase64String(CipherText);

}

private static string Decrypt(string CipherText)
{
    RijndaelManaged aes = new RijndaelManaged();
    aes.BlockSize = 128;
    aes.KeySize = 256;

    aes.Mode = CipherMode.CBC;
    aes.Padding = PaddingMode.PKCS7;

    byte[] keyArr = Convert.FromBase64String(keyStr);
    byte[] KeyArrBytes32Value = new byte[32];
    Array.Copy(keyArr, KeyArrBytes32Value, 32);

    // Initialization vector.   
    // It could be any value or generated using a random number generator.
    byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };            
    byte[] IVBytes16Value = new byte[16];
    Array.Copy(ivArr, IVBytes16Value, 16);

    aes.Key = KeyArrBytes32Value;
    aes.IV = IVBytes16Value;

    ICryptoTransform decrypto = aes.CreateDecryptor();

    byte[] encryptedBytes = Convert.FromBase64CharArray(CipherText.ToCharArray(), 0, CipherText.Length);
    byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
    return ASCIIEncoding.UTF8.GetString(decryptedData);
}

现在一切正常。
有关AES的详细信息，{@ 3}}由@deathismyfriend提供。
它也很有用。

Answer 2

我认为blockSize应该是128，密钥大小是256.keyStr应该是32个字符长，而IVstr应该是16个字符长。这可能有所帮助，因为它描述了为什么128位必须用于块大小以及密钥大小可以是什么。 csrc.nist.gov/publications/fips/fips197/fips-197.pdf

你在解密方法中有这个。

    aesEncryption.Padding = PaddingMode.None;

我相信你也需要把它放在加密方法中。

另外，为什么不将此方法用于键和IV。

    aes.Key = ASCIIEncoding.ASCII.GetBytes(keyStr); 
    aes.IV = ASCIIEncoding.ASCII.GetBytes(ivStr);

Answer 3

在我最近的一个项目中，我的任务是建立一个带有加密部分的URL以传递到另一个网站。他们在服务器上运行java，而我们用c＃开发。

我知道这与你创建的任务不完全匹配，但希望这可以帮助那些试图找到答案的人：）

我从他们的开发人员那里收到了以下内容，以便从

中构建加密

enter image description here

要在c＃中完成此操作，我执行了以下操作：

    public String Encrypt(String plainText, String key)
    {
        var plainBytes = Encoding.UTF8.GetBytes(plainText);
        return Convert.ToBase64String(Encrypt(plainBytes, GetRijndaelManaged(key)));
    }

    private RijndaelManaged GetRijndaelManaged(String secretKey)
    {
        var keyBytes = new byte[16];
        var secretKeyBytes = Encoding.ASCII.GetBytes(secretKey);
        Array.Copy(secretKeyBytes, keyBytes, Math.Min(keyBytes.Length, secretKeyBytes.Length));
        return new RijndaelManaged
        {
            Mode = CipherMode.ECB,
            Padding = PaddingMode.PKCS7,
            KeySize = 128,
            BlockSize = 128,
            Key = keyBytes,
            IV = keyBytes

        };
    }

    private byte[] Encrypt(byte[] plainBytes, RijndaelManaged rijndaelManaged)
    {
        return rijndaelManaged.CreateEncryptor()
            .TransformFinalBlock(plainBytes, 0, plainBytes.Length);
    }

Answer 4

我对此算法有问题（仅在Java中），并且做了小小的改动。

Diff Image

// Java code - Cipher mode CBC version.
// CBC version need Initialization vector IV.
// Reference from https://stackoverflow.com/questions/6669181/why-does-my-aes-encryption-throws-an-invalidkeyexception/6669812#6669812
public static String key = "FFClY170hLrhsDnKUEhJ4FhVOnrpNNFFClY170hLrhsDnKUE";
public static byte[] key_Array = Base64.decodeBase64(key);

public static String encrypt(String strToEncrypt) {
    try {
        //Cipher _Cipher = Cipher.getInstance("AES");
        //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
        Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");

        // Initialization vector.   
        // It could be any value or generated using a random number generator.
        byte[] iv = {1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7};
        IvParameterSpec ivspec = new IvParameterSpec(iv);

        key_Array = Arrays.copyOf(key_Array, 32);

        Key SecretKey = new SecretKeySpec(key_Array, "AES");
        _Cipher.init(Cipher.ENCRYPT_MODE, SecretKey, ivspec);

        return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));
    } catch (Exception e) {
        System.out.println("[Exception]:" + e.getMessage());
    }
    return null;
}

public static String decrypt(String EncryptedMessage) {
    try {
        //Cipher _Cipher = Cipher.getInstance("AES");
        //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
        Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");

        // Initialization vector.   
        // It could be any value or generated using a random number generator.
        byte[] iv = {1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7};
        IvParameterSpec ivspec = new IvParameterSpec(iv);

        key_Array = Arrays.copyOf(key_Array, 32);

        Key SecretKey = new SecretKeySpec(key_Array, "AES");
        _Cipher.init(Cipher.DECRYPT_MODE, SecretKey, ivspec);

        byte DecodedMessage[] = Base64.decodeBase64(EncryptedMessage);
        return new String(_Cipher.doFinal(DecodedMessage));

    } catch (Exception e) {
        System.out.println("[Exception]:" + e.getMessage());

    }
    return null;
}

在Java中加密和在C＃中解密为AES 256位

更新

4 个答案: